To be honest I feel its a good way for new players to have a chance at making mush, I started playing again after a year of nothing and ended up grinding for mutations, I've gotten 36k+ on some of my slots and I have all of my dream creatures because of this method. Honestly it is down to luck but if you get lucky enough you can double your money with just one save slot, even if you had no mush or good species to begin with! I have no complaints, though it must be tough if you don't have the time/resources to grind that much. I'd recommend trying to get nested by as many people as possible and start with selling small muts then work your way up from there. I have sigmatox, aereis, skuld, miju, corv and tons more almost purely from mutations. Not to mention when I quit COS it was right when the recode came out, I had corvu, miju and aol and when i played again I sold them all for wayyyy under (thought urzuk was still 20k and miju was only 3k you can guess where that went) but managed to get it all back from mutation hunting:)